Faith
Powers? That what you think makes him special. You have no idea Faith.
Right, sure, Natives, so can he go after that werewolf thats a witch, or any of the other non natives. AI's chosen to deal with the native threats by the things that pulled us into this city, a city none of us asked for. He'd have been better at home killing Lilith and... Sure the city gave us good things, more than anything it gave Sam his family back and seeing him happy like that is important to me. But its not gonna change him, not really, not the core of him.
And sure experiances have an effect on people, I mean, wow, a world where Azazel won...that, really has to be something, but the things Sam believes the things he was raised to believe, the things John and Dean believe, you really want to change those.
Sam was never gonna leave me behind, he was scared, he was angry and he lashed out, you were there for him, but supporting me. I'm not sure you were, I mean you were all kinds of supportive to Heather near the end.
I hope you realize soon what I'm saying, but right now I have plans I can't be late for. I'm sure you understand.